Finding the Pieces of the Puzzle

Okay, so we were having smooth sailing (as smooth as it can be on the Sea of Autism) for about a month - we were having success with chelation, Sean was making strides - such as becoming fully potty trained. For parents with an autistic child, we all know what a HUMONGOUS deal this is! It's a huge milestone. I almost threw out the leftover Pull Ups, but decided not to just yet. Well, thank God for intuition because little did I know that just a few short weeks later, Sean would be back in them. Sigh...
I guess the most distressing part about it is that we don't know WHY Sean has reverted back to crapping in his pants. But I'm finding it very hard to deal with. It's a big loss, but hopefully one that can be overcome. We added casein back into his diet about the same time this toilet regression hit. Unfortunately, I also inadvertantly had added gluten back into Sean's diet as well. I saw "Wheat Free" on a package, and for some reason, for a couple of weeks, that translated in my brain as being "Gluten Free". I know, I know, there are other sources of gluten besides wheat. I've been doing this damn diet for a year now and should have been able to easily avoid such a stupid and careless mistake. So is the gluten infraction what caused the pooping in the pants? Or the casein? Hmmm....
Can't answer that yet since Sean hasn't pooped for 2 days. Stay tuned for an update.